1: The tech support team should be able to help you if your subscription doesn’t work right.
2: The movies do rotate due to licensing issues, but I don’t think we’ve had anything leave and never come back, and there’s usually a pretty healthy selection, especially of animated movies and shows (and the shows don’t seem to rotate, or at least not nearly as often as the movies do).
3: We have every issue of a DC comic that’s ever been individually digitized, excluding imprints, the last twelve months, and a few older-but-still-recent big sellers. These don’t rotate and more are being added every month. If you read even one issue a day for a year’s subscription time, you’ll be paying a tiny fraction of what those issues would cost to buy individually. The price value for the comics alone is ridiculously good even without movies and TV.
And an additional note: The bulk of the complaints recently have been about the original series being unstable, with two of the four we’ve had so far not getting renewed for second seasons. That’s a legitimate concern, but contrary to what a lot of people seem to think, it’s not some apocalyptic catastrophe. There’s still a bunch of others that are doing fine.